Preheat your oven to 180°C/350°F/gas 4. Rub one large or two small baking sheets with a little olive oil.
In a bowl, mix together the flour, salt, pepper and chilli flakes. Pour in the olive oil and stir it in with a fork. Continue stirring while you slowly pour in about 200ml cold water. You might not need it all – use just enough to form a ball of dough. You don’t want it to get too wet!
Roll out the dough into one or two rectangles, as thinly as you can. Place the roll(s) on to the prepared baking sheet(s). Drizzle with a little olive oil, and sprinkle with some more salt and chilli flakes if you like. Bake in the preheated oven for 30 minutes until golden and crispy enough to snap when broken.
To serve, break the large cracker(s) into irregular pieces. Any leftovers can be stored in a tin.